drivers/usb/host/ohci-omap3.c

   1 /*
   2  * ohci-omap3.c - driver for OHCI on OMAP3 and later processors
   3  *
   4  * Bus Glue for OMAP3 USBHOST 3 port OHCI controller
   5  * This controller is also used in later OMAPs and AM35x chips
   6  *
   7  * Copyright (C) 2007-2010 Texas Instruments, Inc.
   8  * Author: Vikram Pandita <vikram.pandita@ti.com>
   9  * Author: Anand Gadiyar <gadiyar@ti.com>
  10  * Author: Keshava Munegowda <keshava_mgowda@ti.com>
  11  *
  12  * Based on ehci-omap.c and some other ohci glue layers
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  27  *
  28  * TODO (last updated Feb 27, 2011):
  29  *      - add kernel-doc
  30  */
  31
  32 #include <linux/platform_device.h>
  33 #include <linux/pm_runtime.h>
  34 #include <linux/of.h>
  35 #include <linux/dma-mapping.h>
  36
  37 /*-------------------------------------------------------------------------*/
  38
  39 static int ohci_omap3_init(struct usb_hcd *hcd)
  40 {
  41         dev_dbg(hcd->self.controller, "starting OHCI controller\n");
  42
  43         return ohci_init(hcd_to_ohci(hcd));
  44 }
  45
  46 /*-------------------------------------------------------------------------*/
  47
  48 static int ohci_omap3_start(struct usb_hcd *hcd)
  49 {
  50         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
  51         int ret;
  52
  53         /*
  54          * RemoteWakeupConnected has to be set explicitly before
  55          * calling ohci_run. The reset value of RWC is 0.
  56          */
  57         ohci->hc_control = OHCI_CTRL_RWC;
  58         writel(OHCI_CTRL_RWC, &ohci->regs->control);
  59
  60         ret = ohci_run(ohci);
  61
  62         if (ret < 0) {
  63                 dev_err(hcd->self.controller, "can't start\n");
  64                 ohci_stop(hcd);
  65         }
  66
  67         return ret;
  68 }
  69
  70 /*-------------------------------------------------------------------------*/
  71
  72 static const struct hc_driver ohci_omap3_hc_driver = {
  73         .description =          hcd_name,
  74         .product_desc =         "OMAP3 OHCI Host Controller",
  75         .hcd_priv_size =        sizeof(struct ohci_hcd),
  76
  77         /*
  78          * generic hardware linkage
  79          */
  80         .irq =                  ohci_irq,
  81         .flags =                HCD_USB11 | HCD_MEMORY,
  82
  83         /*
  84          * basic lifecycle operations
  85          */
  86         .reset =                ohci_omap3_init,
  87         .start =                ohci_omap3_start,
  88         .stop =                 ohci_stop,
  89         .shutdown =             ohci_shutdown,
  90
  91         /*
  92          * managing i/o requests and associated device resources
  93          */
  94         .urb_enqueue =          ohci_urb_enqueue,
  95         .urb_dequeue =          ohci_urb_dequeue,
  96         .endpoint_disable =     ohci_endpoint_disable,
  97
  98         /*
  99          * scheduling support
 100          */
 101         .get_frame_number =     ohci_get_frame,
 102
 103         /*
 104          * root hub support
 105          */
 106         .hub_status_data =      ohci_hub_status_data,
 107         .hub_control =          ohci_hub_control,
 108 #ifdef  CONFIG_PM
 109         .bus_suspend =          ohci_bus_suspend,
 110         .bus_resume =           ohci_bus_resume,
 111 #endif
 112         .start_port_reset =     ohci_start_port_reset,
 113 };
 114
 115 /*-------------------------------------------------------------------------*/
 116
 117 /*
 118  * configure so an HC device and id are always provided
 119  * always called with process context; sleeping is OK
 120  */
 121
 122 /**
 123  * ohci_hcd_omap3_probe - initialize OMAP-based HCDs
 124  *
 125  * Allocates basic resources for this USB host controller, and
 126  * then invokes the start() method for the HCD associated with it
 127  * through the hotplug entry's driver_data.
 128  */
 129 static int ohci_hcd_omap3_probe(struct platform_device *pdev)
 130 {
 131         struct device           *dev = &pdev->dev;
 132         struct usb_hcd          *hcd = NULL;
 133         void __iomem            *regs = NULL;
 134         struct resource         *res;
 135         int                     ret = -ENODEV;
 136         int                     irq;
 137
 138         if (usb_disabled())
 139                 return -ENODEV;
 140
 141         if (!dev->parent) {
 142                 dev_err(dev, "Missing parent device\n");
 143                 return -ENODEV;
 144         }
 145
 146         irq = platform_get_irq(pdev, 0);
 147         if (irq < 0) {
 148                 dev_err(dev, "OHCI irq failed\n");
 149                 return -ENODEV;
 150         }
 151
 152         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 153         if (!res) {
 154                 dev_err(dev, "UHH OHCI get resource failed\n");
 155                 return -ENOMEM;
 156         }
 157
 158         regs = ioremap(res->start, resource_size(res));
 159         if (!regs) {
 160                 dev_err(dev, "UHH OHCI ioremap failed\n");
 161                 return -ENOMEM;
 162         }
 163
 164         /*
 165          * Right now device-tree probed devices don't get dma_mask set.
 166          * Since shared usb code relies on it, set it here for now.
 167          * Once we have dma capability bindings this can go away.
 168          */
 169         if (!dev->dma_mask)
 170                 dev->dma_mask = &dev->coherent_dma_mask;
 171         if (!dev->coherent_dma_mask)
 172                 dev->coherent_dma_mask = DMA_BIT_MASK(32);
 173
 174         hcd = usb_create_hcd(&ohci_omap3_hc_driver, dev,
 175                         dev_name(dev));
 176         if (!hcd) {
 177                 dev_err(dev, "usb_create_hcd failed\n");
 178                 goto err_io;
 179         }
 180
 181         hcd->rsrc_start = res->start;
 182         hcd->rsrc_len = resource_size(res);
 183         hcd->regs =  regs;
 184
 185         pm_runtime_enable(dev);
 186         pm_runtime_get_sync(dev);
 187
 188         ohci_hcd_init(hcd_to_ohci(hcd));
 189
 190         ret = usb_add_hcd(hcd, irq, 0);
 191         if (ret) {
 192                 dev_dbg(dev, "failed to add hcd with err %d\n", ret);
 193                 goto err_add_hcd;
 194         }
 195
 196         return 0;
 197
 198 err_add_hcd:
 199         pm_runtime_put_sync(dev);
 200         usb_put_hcd(hcd);
 201
 202 err_io:
 203         iounmap(regs);
 204
 205         return ret;
 206 }
 207
 208 /*
 209  * may be called without controller electrically present
 210  * may be called with controller, bus, and devices active
 211  */
 212
 213 /**
 214  * ohci_hcd_omap3_remove - shutdown processing for OHCI HCDs
 215  * @pdev: USB Host Controller being removed
 216  *
 217  * Reverses the effect of ohci_hcd_omap3_probe(), first invoking
 218  * the HCD's stop() method.  It is always called from a thread
 219  * context, normally "rmmod", "apmd", or something similar.
 220  */
 221 static int ohci_hcd_omap3_remove(struct platform_device *pdev)
 222 {
 223         struct device *dev      = &pdev->dev;
 224         struct usb_hcd *hcd     = dev_get_drvdata(dev);
 225
 226         iounmap(hcd->regs);
 227         usb_remove_hcd(hcd);
 228         pm_runtime_put_sync(dev);
 229         pm_runtime_disable(dev);
 230         usb_put_hcd(hcd);
 231         return 0;
 232 }
 233
 234 static const struct of_device_id omap_ohci_dt_ids[] = {
 235         { .compatible = "ti,ohci-omap3" },
 236         { }
 237 };
 238
 239 MODULE_DEVICE_TABLE(of, omap_ohci_dt_ids);
 240
 241 static struct platform_driver ohci_hcd_omap3_driver = {
 242         .probe          = ohci_hcd_omap3_probe,
 243         .remove         = ohci_hcd_omap3_remove,
 244         .shutdown       = usb_hcd_platform_shutdown,
 245         .driver         = {
 246                 .name   = "ohci-omap3",
 247                 .of_match_table = omap_ohci_dt_ids,
 248         },
 249 };
 250
 251 MODULE_ALIAS("platform:ohci-omap3");
 252 MODULE_AUTHOR("Anand Gadiyar <gadiyar@ti.com>");